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一条完整的汽车电路,不仅要有足够的电压,还必须具有良好的接地,才能构成正常的工作回路。如果电路中供电或接地回路连接不实,哪怕只是一个并不引起人们重视的0.01 Ω的电阻,轻则使负载部件出现欠电压现象,重则会引发电路系统中许多“奇特”的故障。例如:这0.01 Ω的电阻发生在起动电流为200 A的起动线路中,根据欧姆定律它将会导致一个2V的线路压降(200 A×0.01 Ω=2 V),轻则使起动机效率下降,重则导致发动机转速降低和转速传感器正弦波幅值降低,因而不足以引发ECU产生触发信号而不能起动。如果发生在电子控制系统,由于系统中传感器及执
A complete car circuit, not only have enough voltage, but also must have a good grounding, to form a normal working circuit. If the power supply or ground circuit in the circuit is not connected properly, even a 0.01 Ω resistor, which is unimportant, causes an undervoltage on the load, causing many “strange” faults in the circuit system. For example: This 0.01 Ω resistor occurs in a starting line with a starting current of 200 A, which according to Ohm’s law will result in a 2 V line drop (200 A × 0.01 Ω = 2 V), which in turn will reduce the efficiency of the starter , Resulting in a decrease in engine speed and a decrease in the amplitude of the sine wave of the speed sensor, which is not enough to cause the ECU to generate a trigger signal and fail to start. If it occurs in the electronic control system, due to the sensor and the system